I installed the bosch copper w9dc new bosch # at pep boys is 7511
Gapped them at .044 (only difference from stock)
They are dirt cheap and work
I bought an extra set at the dolllar+ price
Why look for problems
There is plenty of other items to maintain on this old car
I followed the letters on this form and the boys were right
They work .....

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)